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You would need to adjust the tension screw so the tension is looser than usual. However, remember to mark the setting BEFORE making any adjustments so you will know where to return the original setting.

How to change the tension on a sewing machine?Adjust your top tension if it's too tight. To decrease your top tension if it is too tight, turn your knob so the numbers are decreasing. Try ½ to 1 number lower, then test the stitches on a piece of scrap fabric. Continue until it looks even on both sides and you can no longer see the bottom thread on the top.

Usually, tension adjustments are made to the top. The bobbin tension is adjusted mainly only when using a different weight of thread (either very thin or very thick). Very seldom is the bobbin tension changed.

Generally, tension adjustments are made using the upper thread tension. Most likely the upper tension is set too tight and is pulling the bobbin thread up. Loosen the upper tension and try again. Tension is accurate when the upper thread and bobbin thread meet in the middle of the fabric. Whenever fabric, thread & needle are changed, there may be a need to adjust the upper tension.

HINT: When threading the upper thread, make sure the presser foot is RAISED during threading to make sure the upper tension disks are open and the thread seats properly.

Bobbin tension is only adjusted when the tensions are way out of whack. Only slight turns of the bobbin case tension screw are made in graduated movements and testing occurs after each adjustment.

Generally bobbin tension is the last thing to try to adjust on your machine. Most sewists adjust the bobbin tension ONLY if they are using very lightweight or very heavyweight thread in the bobbin. Most sewists will advise to make all possible adjustments to the top tension before tackling the bobbin tension to resolve issues.

I'm sorry, but you will have to be more specific. There is a top and bottom tension. The top tension is adjusted using a dial of some kind, visible on your machine. It has numbers on it; generally the lower the number, the tighter the tension. The bobbin tension generally does not need adjusting, although it can be adjusted. Please write again to let me know what it is doing that leads you to believe the tension needs adjusting.

It appears that your car is equipped with multiple v-belts, rather than a serpentine belt so there most likely aren't tensioner pullies. Here is some general info that may help.

Alternator
To adjust the tension of the alternator drive belt on older models, loosen the pivot and mounting bolts on the alternator. Using a wooden hammer handle, or a broomstick as a prying device, move the alternator one way or the other until the proper tension is achieved. Do not use a screwdriver or any other metal device such as a pry bar, as a lever. Newer models use a tension adjusting bolt. Loosen the pivot bolt and the locking bolt, then turn the tension adjusting bolt until proper tension is achieved. Tighten the bolts securely, run the engine about minute, stop the engine then recheck the belt tension.
Air Conditioning Compressor
A/C compressor (always use caution when working near the A/C compressor to avoid damaging the refrigerant lines) belt tension can be adjusted by turning the tension adjusting bolt which is located on the compressor tensioner bracket. Turn the bolt clockwise to tighten the belt and counterclockwise to loosen it.
Air Pump
To adjust the tension of the air pump drive belt, loosen the adjusting lever bolt and the pivot bolt. Move the pump in or out until the desired tension is reached.
NOTE: The tension should be checked between the air pump and the crankshaft pulley on cars without air conditioning. On cars with A/C the tension should be checked between the compressor and the crankshaft pulley. Power Steering Pump
Tension on the power steering belt is adjusted by means of an idler pulley (some models may use just a lower adjusting bracket setup, similar to the alternator adjustment service procedure). Loosen the lock bolt and turn the adjusting bolt on the idler pulley until the desired tension is felt, then tighten the lock bolt.

This procedure involves correcting the tension on the power steering accessory and A/C compressor drive belt.

1. Loosen the power steering pump locking bolts A and B and pivot bolt C(Illustration 1 and 2 ) to allow
adjustment of belt tension.
2. Using a 1/2" breaker bar, adjust belt tension by applying torque to the square
hole "D" on the power steering pivot bracket. Adjust the tension as follows: